<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8">
		<title>判断身体质量指数</title>
	</head>
	<body>
		<script type="text/javascript">
			var BMI = 23;
			var result = "";
			if (BMI < 20) {
				result = "体重过轻";
			} else if (BMI >= 20 && BMI < 25) {
				result = "体重适中";
			} else if (BMI >= 25 && BMI < 30) {
				result = "体重过重";
			} else if (BMI >= 30 && BMI < 35) {
				result = "肥胖";
			} else {
				result = "非常肥胖";
			}
			document.write("BMI：" + BMI);
			document.write("<br>结果：" + result);
		</script>
	</body>
</html>
